OverviewIntroductory CommentsExample of Wide Dispersion of Results Following Code ProcedureATC-63 Project: Quantification of Building System and Response ParametersATC-58: Development of Next-Generation Performance-Based Seismic Design GuidelinesBreaking the Uniform Hazard Spectrum into component events: The effect of epsilon on response spectra and structural responsePEER Ground Motion Selection & Modification (GMSM) Working GroupCategorization of Ground Motion Selection and Modification MethodsStructural Models used to EvaluateStructural Models used to Evaluate GMSM MethodsEvaluation of GMSM Methods: Results